Hemstitching-machine.



H. UNGER.

HEMSTITCHING' MACHINE.

APPLICATION TILED OCT. 30, 13109. 988,Q5() Patented M31228, 1911.

2 SHEETSSHEIZT Fig.1.

H. UNGBR.

HEMSTITGITING MgcmRE, APPLICATION Il-LED OCT. 30,1905.

988,050. Patented M11228, 1911.

2 SHEETS-SHEET S!- UNITED STATES PATENT OFFICE. I

nob enema, or BERLIN, GERMANY, assrenon T LINTZ & ECKHARDT, or BERLIN,GERMANY.

. HEMSTITCHING-IVIACHINE.

Specification of Letters l ateut. Patented ltlar. 28, 1911 Applicationfiledflctober 30, 1909. Serial No. 525,473.

it auwhom-e m concern} I Bei't knowntha't I, HUGO .UNGER, a sub- 'ect ofthe King OLSaXOny, residing at Berin, German have invented certain newand useful Improvements in Hemstitching- Machines; and I-do herebydeclare the following to bee. full, elear, and exact description of theinvention, such as will enable other skilled in the art to which itappertains to was and use the same", reference ,heing-"hadto?theacconipanying drawings, and toletters ot: figures of reference'markedthereon, which form a part of this specification.- 1 T Myinveiitionrelates to hemstitch sewing machines ttndniore particularly tothe needle bar mounting mechanism and means forspreadin'g the needlesduring the hemstitching' 0 ration, as will be hereinafter fully descried and claimed."

Referring to thedrawmgs, in which like parts are similarly designated,Figure 1 is an"el evation of-so much of the hemstitch sewing machine asis necessary for an un deretanding otmy invention and shows the needlesspread. "Fig. "2 is a similar view showing needles in closed position.-Fig. 3 is a side view partly insection. Fig. 4 is a section on theinlet-4' of Fig.2 and Fig.

5 is asection'on the Knee-5 of Fig. 2.-

Mounted on the frame a of the machine is a bracket (1 in which ismounted a short counter shaft 6 carrying a cam wheel e and trg'ear wheel(i gearin with a similar gear B on the drivin shai t a of the machine.

The relation of tie diameters of wheel (1 to wheel a in the accompanyingdrawing is 3 7 to 1, however any other proportion may be usedto producea correspondingly altered dostitoh. ,The cam wheel 0 1s rovided with a.

" cam groove 0' whichis so ormed that the.

needles take up their innermost posit-ion dur; an two stitches and movea part for each Qtlurd stitch. In a known manner the cam 15 may be soformed that the needles slightlymove apart during the two inner stitchesfor thepurpose of enlargiugthe stitch hole .in the material. .Pivoted onthe frame of the machinelat e'ish' a bell crank. lever e, who u ri t armas a in e en aging .the g i'od v'e q" in the cam wheel The othefarm'otthe said lever is connected to the arm f' of a. double armed lever -f, f

.-piv() ted-at f, this connection being efiected .cured t0 the'cn'd ofthe tube It.

by a bolt 1 which. guided in a slot f in the lever arm f, moves in agroove 0 in the horizontal arm. of the lever and may be fixed to the armf by means of a nut 9'. By adjusting the bolt ,g from the point 6'toward the point f. the throw of the lever f'f can be varied from zeroto a maximum. A vertically reciprocablc operating slide 2' on themachine frame may be actuated directly -by the lever f f It is however,moretadvau tageous to connect the lever f f with 'the slide :5 by meansof an adjustable member, such as the lever h which is'also pivoted at. fand by means of a screw it passing" through a sloth pivot'ally connectedwith said slide. The lever 71. is'provided with a slot 71 throughWhichfpzisses an adjustable screw h capableof clamping the lever h inangular relation to the lever f, 1. The arcuate slot It and theadjusting screw h permit the adjustment of the lever h with 75 respectto the lever f f to adjust the end positions-of the slide 5 withoutaffecting the extent of movement of the slide 2'. On the head of themachine is revolubly mounted a tube is, which is actuated from the crankby means of the beveled wheels-Z: In and within which the needle bars Iare freely suspended at Z from a collar Z said collar being engaged by afork 1 of a reciprocable slide l operated ironic shaft 0, of the machineby means of an eccentric a which is connected to apivot l fixed on theslide Z k is a. spool holder.

It willbe noted that the needle bars'l are suspended at their upper endsso that they are free to swing under the influence of a needle spreadingmechanism. The lower end of each needle. bar passes through a sleeve m,and each sleeve is on a slide m that is mounted on a supporting block Inse- Each slide has a. slot 122?, said slots being inclined to eachother-as shown.. On the lower end'of I the tube is isa collar 11.engaged by the fork i of the slide i'an'd depending from this collar oneach side of the tube In are brackets. 11. in'whichare screws oract-uatin pins 12%.- taking-into the slots m. e colar n is slidahl'e butnot rotatable on the tube In and consequently when it is depressedrelatively to this tube the ins 11 taking into the slots forces theslides m together. The piercer 0 fixed in a known manner between theneedles Z hastwo lateral grooves in its sides into which the needles Z,secured at the end of the needle bars 1, may rest when in their inwardposition, Fig. 2. The presser foot 1) is also provided with two he esFigs.

'1 and 2, through which the decorating thread is passed, and which,during the movement of the fabric by reason; of the pier'cer 0 passingthrough the goods, is held -10 uniformly stretch the fabric in alldirecelevated during the piercing operation in the customar manner; v

-r is a fabric stretcher containing as usual a rubber ring 1" havingbeveled edges so as tions and at the same time prevent the fabric fromwrinkling during the h emstitchlllg operat1on.-

The operation of the device is as follows:

' The spreading of the needles takes place by 'rea'son' of the cam wheel0 operating during two stitches of the needles Z so as to actuate theslldes m so far inward 1'. toward the iuercer a, Fig. 2, that they onlyhave a small 'pi'eading movement for the" purpose of.

fzpening the hole made in the fabric. Be-

fore the third stitch the collar 11. is' raised by the fork and slide ai and the lever mechanismh f f e so that the pins n carried in thedepending lugs 71' of the collar nwill be moved upward and in so doingmove the slide 172 outward to the req nired extent, (Fig. 1). The extentof spreading of the needles Z is controlled by the adjustment ofthe boltg to-and from the .pivot e as above described. By adjusting the lever hwith respect to the lever arm f, the collar n and the slide'z' arevaried in height whereupon the slides m are either spread or broughttogether and the needle ba-rs correspondingly moved. By this means thedistances between the inner and the outer row of stitches is altered. Byaltering the relative proportionof the gearing a dthe number of theinner and the outer stitches can be altered,

so that for example for .each two inner stitches 'two ormore outerstitches will be made. I

Claims. a 1. In a hemstitching .machine, .the combination with the frameand the driving shaft, of a gear wheel on the shaft, a bracket mountedon the frame, a counter shaft mounted in-the bracket, a cam and a gearwheel that meshes with the aforesaid'gear wheel on the counter shaft, abell crank lever pivoted to the frame one arm of which is actuated bythe cam and the othcrarm of which has a slot, a composite levercoinprising a slotted section, an adjusting screw lever, a secondsection and a third section.

in the slots of said section and, hellcrank having two slots, the secondand third sec.- tions secured to the first section, an ad usting screwpassin through one of the-slots" in the third section into the secondsection, a rec'iproeable slide having a fork, and a screw passingthrough the second slot into the s1ide,-a tubemounted rotatably intheframe, a collar slidable, but not rotatable on the tube and engaged bythe fork of said slide, slides mounted to move transversely on the tube,each having an inclined slot and a sleeve, two lugs depending from thecollar, a pin in each 'lug taking into a ,slot in a slide, a needle barsuspending collar, an actuating slide therefor, two needle barsindependently and pivqtally connected to the needle bar collar, thelower end of;-'each needle bar g 2. In a hemstitchingmachine, the.combination witlrthe frameand the driving shaft, of a gear wheel-on theshaft, abracket mounted on the frame, a counter shaft passing through asleeve on awheel that meshes with the aforesaid gear wheel on thecounter-shaft, a bell crank lever pivoted tolthe frame one arm of whichis actuated by the cam and the other-farm. of

which has a slot, a composite lever comprising a slotted sect-ion,an'adj usting screwfin the slots of said section and bell crank lever, asecond section and a third sectionhaving. two slots, the secondandthird'seetion s se cured-to the first section, an adjusting screwpassing through one of the, slpts in the third .mounted in the bracket,a cam and a gear section into'the'second sect on, a =reciprocable slidehaving a fork, and "a. screw passing through the second slot into theslide, .a

needlebar passingthrough a. sleeve, pins carried by the second col a'rto en age the slots to actuate theslides and a lever'to actuate theslide. Q

. 4. In a hemstitehing sewing machine havin a driving shaft the combnation with a co lar, and rigid rciprocable needle bars" pivoted theretoat their upper ends; of slides through which the bars "pass,mechanismto' actuate the slides from the shaft, including" read of theneedle means to adjust the. s bars'and means to a outer limits of thebars.

5. In a heinstitch sewin'g machine having a driving shaft thecombination with re-.

'cipro'cable needle bars pivoted at their 'u' per ends, slides'throughwhich said-nee eust the inner and-I bars pass each having a cam slot,means to engage the slots and mechanism to operate said means from theshaft includinga composite lever having means to ad ust the spread .ofthe bars and means to adjust their inner and outer limits.'

' 6. In a hemstitchin machine the combination with a main-s aft andlaterally vivbratable needle bars; of a cam actuated from the mainshaft, 9. bell-crank lever 0 erated by the earn, a two-part leveradjustab y connected to the bell-crank to vary the lateral vibration ofthe needle bars, means to adjust .one of the parts of the lever'withrespect to the other to vary the distance between the rows of stitchesand means to operatively connect said leverto the needle bars.

'7. In a hemstitching machine, the combination with pivoted needle bars;of guides for the lower ends of said bars, a collar reciprocablebutnon-rotatable with respect to the needle bars, means carried by thecollar to cooperate with and operate the guides, a

-. slide to actuate the collarand' a two-part adjustable lever to'actuate the slide and means to vary the angular relation of the twoparts of the lever.

. 8. In a hemstitchin machine, the combination with a needle bar supportand meaus'to reciprocate it; of needle bars pivotedat their upper ends-to the support, needle bar spreading devices including alever to adjustthe distance between the needle bars to regulate the distance betweenthe rows of stitches and a secondary lever to which the former lever isadjustably secured to vary the extent of lateral vibration of the needlebars.

9. In a hemstitching machine, a needle bar supporting 'collar, means toreciprocate the collar and in which said collar is rotatably mounted,needle barspivoted to the collar at their upper ends, guides for thelower ends of the bars, means/to adjust the distance apart of theguides, means to spread the needle bars, and means to rotate the needlebars about an axis common to them.

10. In a. hemstitching machine, a needle bar supporting collar, means tovertically reciprocate the collar and in which the collar is rotatablymounted, a tube, means to rotate it, a collar on the tube, guides on thelower ends of the tube in which the needle bars are guided and havinginclined slots,

-means to actuate the second collar, pins carried thereby to enter theslots in the guides,

a slide to actuate the second collar, and

means to actuate theslide for actuating the I collar and guides,including means to adjust the' distance a art of the needle bar guidesto vary the distance apart of the rows of stitches and means to adjustthe spread of the guides from zero to a maximum to vary the extent oflateral vibration. y

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

. HUGO UNGER.

\Vitnesses JOHANNES .HEIN, HENRY HASPER.

